The Craft of Political Research by W. Phillips Shively

Author:W. Phillips Shively
Language: eng
Format: epub, pdf
Publisher: Taylor & Francis
Published: 2017-05-12T16:00:00+00:00

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Use of a Control Group

The natural experiment. “Organizing the Poor” is an example of a design in which a control group has been added to handle the sorts of problems we just encountered. It is a natural experiment, a design in which a test group (i.e., a group exposed to the independent variable) and a control group (a group not exposed to the independent variable) are used, but in which the investigator has no control over who falls into the test group and who falls into the control group. People either select themselves into the group or nature selects them in; the investigator has no control over who is in or out. In “Organizing the Poor,” the matter of who was contacted by the campaign workers was decided by the workers’ own choice of whom to contact and by the extent to which different people made themselves available for contact by the campaign workers. The natural experiment design is of the form:

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